Already purchased the HP50's but haven't received them yet.  I thought they were the best you  could buy for 200-300 but I found these forums and was blown away by all the love for different types of headphones.  I mostly listen to hip-hop and a little bit of every other genre excluding classical and rock.  I want a headphone that sounds good at every level and I don't want the bass to mess up with the sound quality at all.  So, should I take back the HP50's when I get them and get a different pair or am I fine with the 50's?

Your fine with the HP50.